Of the Causes of Sin, in General (Four Articles)
Summa Theologica — Saint Thomas Aquinas
We must now consider the causes of sin: (1) in general; (2) in particular. Under the first head there are four points of inquiry:

(1) Whether sin has a cause?

(2) Whether it has an internal cause?

(3) Whether it has an external cause?

(4) Whether one sin is the cause of another?

whether venial sin can be
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